The triplex penthouse will be roughly 9,200 square feet and will have about 9,000 square feet of outdoor space.

Last year, a penthouse at Faena House became the priciest-ever condo to list in Miami Beach when it went on the market with a price tag of $50 million. Now that unit is in contract, and another new-construction Miami Beach penthouse is seeking to hit the $50 million mark.

Located on the top three floors of the Bath Club Estates, an 18-story beachfront condominium being developed by the Peebles Corporation, the triplex penthouse will be roughly 9,200 square feet and will have about 9,000 square feet of outdoor space, said...